What is a solution? AWS is a general use compute resource. There is no reason that they should enforce crypto anywhere other than SSH/etc. That is obviously in the domain of the dependent service to decide and implement. Encryption has a cost/benefit ratio that is different for every client, there's no reason everyone should have to pay and use encryption resources if they don't need them.

I find your observation that this problem is reflected especially in service oriented architectures questionable. By centralizing all resources (including documentation: http://aws.amazon.com/security/) It makes it easier to enforce best practices and standard interfaces. But just because they can doesn't mean it's always a good idea to do that.